What is ACSM? It’s sort of a “key” file for EPUB or PDF eBook, especially for an eBook sold by some online book store or online library. With this “key”, you can get the correct EPUB or PDF eBook associated with “key”. So, don’t be worry next time you buy a book from online book store but only get an ACSM file, with it you can download a complete book. To read ACSM file, you only need...

AZW4 is a format of Kindle books and usually for textbook, which means it’s always a large size file and coming with many patterns, formulas and images. There is a fact you should know, every AZW4 file contains a PDF inside. As we know, Azw4 book is supported by Kindle Fire tablet, Kindle for Android, Kindle for iOS and Kindle for PC/Mac, not including E-Ink Kindle like Kindle Paperwhite and Kindle Voyage. But PDF is supported...

What is AZW4 file? It is a format of Kindle books and it’s not that common compared to Mobi, AZW or AZW3. It is specifically for textbooks and only supported by Kindle for PC/Mac software. There are rumors saying it is going to be supported by Kindle Fire tablets in the future. From the fact above we can easily figure out the shortage of AZW4 file: the narrow reading apps supporting. And here I reveal another fact: every single...

Sometimes when we download a purchased eBook, we only get an ACSM file. Then we get totally confused, having no idea how to read the ACSM file. In fact, ACSM file is sort of “key”, it is always only 2-3 KB. All the eBooks protected by Adobe Adept DRM are coming from ACSM. If you want a complete PDF or EPUB book, you need to convert from the ACSM file. Download Adobe Digital Editions At first download the Adobe Digital...

PDF is an open-format from Adobe Inc., there are bunches of programs which can generate PDF files and that causes a problem: not all the PDF files have correct and complete structure. We call them corrupted PDF files or damaged PDF files. If you get a corrupted PDF by accident, you might not be able to read it (depends on how heavy the PDF is damaged). Once you open the PDF by reading software like Adobe Reader, you will see the...